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Available-for-Sale-Securities - Schedule of Available-for-Sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Cost	$ 32,621	$ 22,766
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(8)	(1)
Estimated Fair Value	32,614	22,768
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	6,430	11,673
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(6)	(1)
Estimated Fair Value	6,425	11,675
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost	5,019	11,093
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	5,019	11,093
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	20,975	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Estimated Fair Value	20,973	0
Sovereign government securities
Debt Securities, Available-for-sale [Line Items]
Cost	197	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 197	$ 0

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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